Here is the update, our developer find the reason is after Android upgrade from Version 8.0 to Version 9.0, it disable all "http" request by default.
The workaround for it is add this line in your Project(Here is sample project "HelloWorld") -> Properties -> AndroidManifest.xml
<application android:usesCleartextTraffic="true" android:label="HelloWorld"></application>
If your xml don't contains that line before, just add this:
Our develope is trying to find a better way to modify in our code inner, so update it late.